Oh, that’s for AssistNow, which is different than CellLocate.
CellLocate is included for free (no special authorization) on the SARA-U201 (also G350, U260, and U270).
CellLocate is not included in the LTE Cat M1 SARA-R410M-02-B.
The current (0.8.0-rc.27) Boron DeviceOS cannot use CellLocate. The next version can’t either. But it will likely be supported shortly thereafter. It’s a bug/missing feature that the response from AT+ULOC cannot be read.